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drm/i915/hdcp: mst streams type1 capability check

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It requires to check streams type1 capability in mst topology
by checking Rxinfo instead connector HDCP2.x capability in
order to enforce type0 stream encryption in a mix of
HDCP {1.x,2.x} mst topology.
Rxcaps always shows HDCP 2.x capability of immediate downstream
connector. Let's use Rxinfo HDCP1_DEVICE_DOWNSTREAM bit to
detect a HDCP {1.x,2.x} mix mst topology.

Cc: Sean Paul <seanpaul@chromium.org>
Cc: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210319091732.17547-1-anshuman.gupta@intel.com
This commit is contained in:
Anshuman Gupta 2021-03-19 14:47:32 +05:30
parent 053ffdd164
commit 50e945cbaa
3 changed files with 59 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/display/intel_display_types.h
View File

@ -387,6 +387,10 @@ struct intel_hdcp_shim {
int (*hdcp_2_2_capable)(struct intel_digital_port *dig_port,
bool *capable);
/* Detects whether a HDCP 1.4 sink connected in MST topology */
int (*streams_type1_capable)(struct intel_connector *connector,
bool *capable);
/* Write HDCP2.2 messages */
int (*write_2_2_msg)(struct intel_digital_port *dig_port,
void *buf, size_t size);

39
drivers/gpu/drm/i915/display/intel_dp_hdcp.c
View File

@ -478,6 +478,23 @@ int intel_dp_hdcp2_write_msg(struct intel_digital_port *dig_port,
return size;
}
static int
get_rxinfo_hdcp_1_dev_downstream(struct intel_digital_port *dig_port, bool *hdcp_1_x)
{
u8 rx_info[HDCP_2_2_RXINFO_LEN];
int ret;
ret = drm_dp_dpcd_read(&dig_port->dp.aux,
DP_HDCP_2_2_REG_RXINFO_OFFSET,
(void *)rx_info, HDCP_2_2_RXINFO_LEN);
if (ret != HDCP_2_2_RXINFO_LEN)
return ret >= 0 ? -EIO : ret;
*hdcp_1_x = HDCP_2_2_HDCP1_DEVICE_CONNECTED(rx_info[1]) ? true : false;
return 0;
}
static
ssize_t get_receiver_id_list_size(struct intel_digital_port *dig_port)
{
@ -626,6 +643,27 @@ int intel_dp_hdcp2_capable(struct intel_digital_port *dig_port,
return 0;
}
static
int intel_dp_mst_streams_type1_capable(struct intel_connector *connector,
bool *capable)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
int ret;
bool hdcp_1_x;
ret = get_rxinfo_hdcp_1_dev_downstream(dig_port, &hdcp_1_x);
if (ret) {
drm_dbg_kms(&i915->drm,
"[%s:%d] failed to read RxInfo ret=%d\n",
connector->base.name, connector->base.base.id, ret);
return ret;
}
*capable = !hdcp_1_x;
return 0;
}
static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
.write_an_aksv = intel_dp_hdcp_write_an_aksv,
.read_bksv = intel_dp_hdcp_read_bksv,
@ -774,6 +812,7 @@ static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
.stream_2_2_encryption = intel_dp_mst_hdcp2_stream_encryption,
.check_2_2_link = intel_dp_mst_hdcp2_check_link,
.hdcp_2_2_capable = intel_dp_hdcp2_capable,
.streams_type1_capable = intel_dp_mst_streams_type1_capable,
.protocol = HDCP_PROTOCOL_DP,
};

17
drivers/gpu/drm/i915/display/intel_hdcp.c
View File

@ -32,6 +32,21 @@ static int intel_conn_to_vcpi(struct intel_connector *connector)
return connector->port ? connector->port->vcpi.vcpi : 0;
}
static bool
intel_streams_type1_capable(struct intel_connector *connector)
{
const struct intel_hdcp_shim *shim = connector->hdcp.shim;
bool capable = false;
if (!shim)
return capable;
if (shim->streams_type1_capable)
shim->streams_type1_capable(connector, &capable);
return capable;
}
/*
* intel_hdcp_required_content_stream selects the most highest common possible HDCP
* content_type for all streams in DP MST topology because security f/w doesn't
@ -70,7 +85,7 @@ intel_hdcp_required_content_stream(struct intel_digital_port *dig_port)
if (conn_dig_port != dig_port)
continue;
if (!enforce_type0 && !intel_hdcp2_capable(connector))
if (!enforce_type0 && !intel_streams_type1_capable(connector))
enforce_type0 = true;
data->streams[data->k].stream_id = intel_conn_to_vcpi(connector);